The Permian, which contains workable coal seams, lies unconformably upon the older beds and seems to have been deposited in isolated basins (e.g.
East of Bolsover, the Coal Measures are covered unconformably by the Permian breccias and magnesian limestone.
The principal folding took place at the close of the Carboniferous period, and was contemporaneous with that of the old Hercynian chain of Belgium, &c. The Permian and later beds lie unconformably upon the denuded folds, and in the space between the Montagne Noire and the Cevennes proper the folded belt is buried beneath the horizontal Jurassic strata of the Causses.
This rests unconformably on the pre-Cape rocks.
This system rests unconformably on the Witwatersrand series and is unconformably overlain by the Transvaal system.
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